do not upgrade or downgrade your iphone 3gs baseband if you flash the baseband will cause no wifi ,imei ,bluetooth etc. and restart few seconds because damage your baseband chip i.c. pls more details about your iphone 3gs..
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im really not too sure about it.. i think the whole motherboard has to be changed.. but ul have to ask some1 with more technical knowledge of it..although i dont see the point.. u should just get a new phone.